Add new fns to OrchestratorChainInterface to fetch best/finalized block hash
#75
| Job | Run time |
|---|---|
| 5s | |
| 30m 45s | |
| 1m 47s | |
| 3s | |
| 18m 13s | |
| 11s | |
| 19s | |
| 44m 48s | |
| 51s | |
| 1h 37m 2s |